Well my budget would vote to just wash and oil my K&N.

 

a filter is a filter, as long as it actually filters the air going into the engine. as for which one "let is more air" they both have a 4 inch intake. so therefore they are restricted to the amount of air you can draw through the 4 inch intake.
and i can tell you for a fact you can draw a lot more air through the element of a 6637 than you can draw through the 4 inch pipe going into the engine.
as for the others, i can not say on them because i never saw one.

 

Anything to be gained with the 6637 over the stock air box on a mostly stock truck? (has an AFE 4" turbo back exhaust) How much louder in the cab is the 6637 at highway speeds?

 

Yes you will gain filtration and allow the turbo to spool a bit faster.
It will be noticeably louder not a whole lot

 

i don't hear any difference, but i always have the windows closed and the radio is usually on

 

I don't notice any noise difference at all over the stock filter. About performance on a stuck truck, it seems like I get a little bit better mileage but I changed a few other things about the same time so can't say for sure.

I like the way it's simple and the stock system had a recall due to possible housing leaks, my truck still had the original housing so I was happy to get rid of it.

 

Pretty much sums it up^^^

 

I definitely noticed the difference in noise, especially letting out of heavy throttle... I can hear a very satisfying chuff

 

Wondering if I just get a 45 degree elbo that is 4" exhaust pipe would it be any cheaper than buying the complete kit? I get a exta charge because mine is a 97

 

Thats what some of the members did. I just cut a piece of 4" aluminum pipe I had at work and worked great

 

I got a 4" 45deg polished aluminum elbow off eBay.

 

Or you can go el-cheap-o and use 4" sewer pipe. It is cheap, easy to cut, and once it is painted black, you never know the difference. And for the small amount of pipe that is actually there........ it doesn't matter, just remember to glue to the joints.
when you raise the hood on mine you notice 2 things, the awesome 6637 sitting there, and the red fuel pressure regulator. but to each his own

 

I probably would have gone with pvc if I had thought about it.

 

$35 on ebay. Is that a good price? sounds a little pricey but I've never looked for it before. Anyone got any they don't need?

 

$35 for what? the elbow?